I have an old arrakis install.
Running apt-get update, I get:
[Timeout, that is]
When I ping 18.104.22.168, I get no reply on my omv machine. If I ping the same from another machine in the same network, I do get a reply. Also note, that there was no issue getting the data from other servers (https://openmediavault-plugin-developers.github.io for instance).
What could be the reason for this partial network problem?